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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ca561e861918aa624280fd63e46f707dc2a984f0315121549bb81b40b6f3fc' 
  AND token = 'PqVdxqdNmBvUh41t4hV4W1CRQ5Y+tPRFsa9i5inJqxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}